- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°51'42"N 4°1'12"W
- Eastings/Northings: 264098, 331281
- OS Grid: SH640312
- Mapcode Local: GBR 5V.RMYJ
- Mapcode Global: WH561.6BXF
Location and coordinates are for the approximate centre of Llyn Cwm Bychan within this administrative area.
Geographic features and populated places may cross administrative borders.